Book stand



FIG. 1 is a left front top perspective view of a book stand showing my new design;

FIG. 2 is an end view thereof, the other end view thereof being a mirror image of this view;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a book stand, as shown and described. 